JPH0527304Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the position of adjusting the reflection angle of a rearview mirror for an automobile using a remote control method. This invention relates to an electric remote control drive device that prevents rattling in the thrust direction even if there is a gap between the drive gear and the worm wheel.

[Prior Art] An example of a drive device that automatically adjusts the reflection angle of a mirror by a motor is shown in FIG.
The structure is such that the mirror can swing (arrow A) around the center pivot of the mirror as the center of rotation (see, for example, Japanese Patent Publication No. 60-58054).

That is, in an actuator housing 1 constructed by fitting two parts into a front housing 1a and a rear housing 1b, there are a motor (not shown), a worm 2 attached to the output shaft of the motor, and the worm 2. It houses a worm wheel 3 that meshes with the worm wheel 3.

The worm wheel 3 has annular support parts 8a and 8 provided on the front housing 1a and the rear housing 1b so that the center line thereof is perpendicular to the mirror surface.
A pivot screw 4 is inserted into the center of the worm wheel 3 so as to rotate integrally with the worm wheel. Pivot Screw 4 is
A hemispherical recess 5 is formed in the center of the back surface of the bottom plate 4A, and a hemispherical protrusion 6 provided on the front housing 1a side is fitted into the recess 5, so that the pivot screw 4 can be moved as shown in the arrow around the pivot position of the pivot screw 4. It is supported so that it can tilt in an arc as shown in B.

Further, an adjuster nut 7 is engaged with the threaded portion 4B of the pivot screw 4, and the movable pivot P is formed at the tip of the adjuster nut 7 and connected to the back surface of the mirror holder, and the worm wheel 3 and the pivot screw are connected by a motor. The adjustment nut 7 is moved in the front-rear direction of the mirror surface by rotating the mirror 4, thereby adjusting the inclination angle of the mirror.

[Problems to be solved by the invention] This type of drive device needs to be assembled in such a way that specular vibration (chattering) does not occur. There is a drawback that large play is likely to occur in the thrust direction of the pivot screw 4 due to inevitable misalignment. That is, in the conventional drive device, as shown in FIG. 6, for example, the backlash in the thrust direction is caused mainly between the rear housing 1b and the worm wheel 3, between the front housing 1a and the pivot screw 4, and between the worm wheel 3 and the pivot screw. It is thought that this occurs because there is a gap between the combination with U4, and it takes a considerable amount of man-hours (labor) to tune it. Moreover, in order to enable the arcuate swinging motion (arrow B) of the adjuster nut 7, the lower fitting inner surface of the worm wheel 3 and the pivot screw 4 has a spherical surface 3.
M, and is fitted so that it can tilt relative to this spherical surface using the convex portion 6 of the pivot screw 4 as a fulcrum; Since the contact position with the curved surface 4N is close to the diameter line S of the spherical surface as shown in FIG. 7, a slight deviation in the dimensions of the component causes large play in the thrust direction. This was the main reason why tuning was difficult.

This invention was developed in view of the problems of the conventional method as mentioned above.
To provide an electric remote control drive device in which a screw member and an adjusting nut mating with the screw member are combined so that there is no backlash in the thrust direction even if there is a gap between a worm wheel and a housing.

[Means for Solving the Problems] In order to achieve the above object, the present invention supports a mirror holder having a reflecting mirror so as to be tiltable with respect to an actuator housing, and supports the mirror holder at a position away from the center of rotation of the mirror holder. A device that adjusts the angle of a reflecting mirror by driving an adjusting nut having a spherical portion at its tip that fits into a spherical seat located in the housing back and forth in the front and rear directions of the mirror surface via a worm wheel of a worm mechanism housed in the housing. A cylindrical boss through which the adjusting nut can go in and out is formed in the center of the worm wheel, and an inner surface of one end of the boss and an outer circumferential surface of the adjusting nut each allow movement of the adjusting nut in the axial direction. a screw member fixed to the housing is formed on the central axis of the worm wheel, and a rotational force transmitting rib that restricts relative movement in the circumferential direction and a groove that engages the rib; It is characterized in that the screw member is erected, and a flexible pawl formed protruding from the rear end side of the adjuster nut is screwed into the threaded rod portion of the screw member.

In addition, as long as the screw member is fixed to the housing, the fixing means may be a set screw screwed in from outside the housing. The spherical pivot may be fitted into a socket fixedly disposed in the housing.

[Operation] When the worm wheel rotates, the rotational movement causes the adjustment nut to rotate through a groove formed in the center of the worm wheel and a rotational force transmission rib inserted into the groove. Since this adjusting nut is screwed into a screw member fixed to the housing, it rotates smoothly without being affected by thrust play when the worm wheel rotates, and moves forward and backward in the front and rear directions of the mirror surface.
As the adjuster nut moves back and forth, the mirror holder can swing around the central pivot, allowing the mirror's inclination angle to be adjusted.

[Example] Hereinafter, the drive device of the present invention will be specifically explained based on the drawings. FIG. 1 shows an outline of the electric remote control drive device, and FIG. 2 is an enlarged sectional view of the main parts of the drive device of the present invention. FIG. 3 is an exploded perspective view of the main parts with the housing omitted.

In the figure, 10 is an actuator housing for adjusting the angle of the reflector, and the front housing 1
It is constructed by fitting two parts into a rear housing 0a and a rear housing 10b.

There is a central pivot 30 approximately at the center of the front surface of the housing, which is the center of rotation of the mirror holder 14 having a reflecting mirror, and a spherical receiver provided on the back surface of the mirror holder is located at a predetermined distance from the center of rotation of the mirror holder. An adjusting nut 12 having a spherical pivot portion 13 that fits into a seat 15 is provided in a protruding manner (FIG. 1).

The adjusting nut 12 is made of a cylindrical body 12c as shown in FIG. 2, and has the above-mentioned pivot portion 13 at its head and a plurality of flexible pawls 12a protruding from the rear of the cylindrical body to be screwed into the screw member described later. has been done. Further, on the circumferential surface of the cylindrical body 12c, a plurality of rotational force transmission ribs 12b are provided in a direction perpendicular to the axis of the cylindrical body 12c.
is formed.

The worm wheel 16 has a cylindrical boss 16a formed at its center, through which the adjuster nut 12 can move in and out in the front-back direction. This cylindrical boss 1
6a, an annular support portion 11a provided at opposing positions of the front housing 10a and the rear housing 10b,
11b, the worm wheel 16 is rotatably fitted. The inner surface of one end of the cylindrical boss 16a has a groove 1 into which the rotational force transmitting rib 12b of the adjusting nut can be removably inserted.
6b are formed in a direction radiating from the axis of the boss. Note that when this rotational force transmission rib 12b is inserted into the groove 16b, a kind of slip joint is formed by them, and the adjusting nut 12 is allowed to move in the axial direction, and is prevented from relative movement in the circumferential direction. will be restricted.

The screw member 17 has a flexible pawl 12a of the adjuster nut 12 on a base plate 17a having a rotation stopper.
A threaded rod portion 17b is provided upright to be screwed into the worm wheel 16, and a fitting portion is attached at the center of the annular support portion 11b on the front housing 10a side so as to be located on the central axis of the worm wheel 16. Set screw 1 screwed in from outside
8. Note that, as described above, the flexible pawl 12a of the adjusting nut 12 is screwed into the threaded rod portion 17b of this screw member 17, so when the nut rotates with the rotation of the worm wheel, the threaded rod portion 17b The adjustment nut 12 is configured to go in and out from the cylindrical portion 12c.

Since the device of the present invention has the above-described configuration, when the worm wheel 16 of the worm mechanism driven by the motor rotates, the rotational movement is caused by the groove 1 formed in the center of the worm wheel.
6b and the rotational force transmission rib 12b inserted into the groove.
The adjuster nut 12 rotates via. The adjustment nut 12 is the front housing 10a.
Since it is screwed into a screw member 17 fixed to the worm wheel, it rotates smoothly without being affected by thrust play during rotation of the worm wheel or variations in assembly, and moves back and forth in the front and rear directions of the mirror surface.

The adjust nut 12 is the pivot 13 of the head.
is fitted into the spherical seat 15 provided on the back surface of the mirror holder, and the flexible pawl 12a at the rear end is screwed into the threaded rod portion 17b of the screw member 17, so that the mirror holder is rotated as the adjuster nut moves back and forth. The mirror can swing around the central pivot, making it easy to adjust the tilt angle of the mirror.

4 and 5 show modified embodiments of the screw member. In this embodiment, the screw member 20
A spherical pivot 20b having rotation prevention means is provided at the base (rear end) of the threaded rod portion 20a, and a socket portion 21 supporting the spherical pivot 20b is provided.
The annular support portion 11a of the front housing 10a
It is fixed through a stepped fitting hole 23 provided in the center of the. A settling ring 22 is disposed inside the annular support portion 11a of the front housing 10a. A spherical pivot 20 is provided in the socket portion 21.
There is a spherical seat 21a that fits and supports the screw member 20, and the screw member 20 can be tilted in the direction of arrow B by the spherical seat 21a and the spherical pivot 20b.

When attaching the socket part 21 to the front housing 10a, as shown in FIGS. 4 and 5, the collar 21b of the socket part 21 is fitted into the stepped fitting hole 23 from the outside of the front housing 10a,
The socket part is forcefully fitted into the stepped fitting hole 23 by using the protruding part 21c formed on the outer periphery of the socket part. Of course, when the socket part is fitted into the fitting hole 23, the undercut dimension a below the protrusion part 21c is set so that the socket part itself does not generate thrust play.

Also in this embodiment, the screw member 20 is fixed to the front housing 10a so as not to move in the axial direction, and the screw member 20 is fixed to the front housing 10a so as not to move in the axial direction.
is screwed onto a fixed screw member 20 fixed to the front housing 10a, so even if there is a gap between the worm wheel and the housing,
The worm wheel rotates smoothly without being affected by thrust play during rotation or assembly variations, and moves back and forth in the front and rear directions of the mirror surface. Further, since the screw member 20 is tiltably attached to the socket portion 21 by the spherical seat 21a and the spherical pivot 20b, the adjusting nut 12 can be easily tilted in the direction of arrow B. Therefore, the mirror holder can swing around the central pivot, and the tilt angle of the mirror can be easily adjusted.

[Effects of the Invention] As described above, according to the present invention, since the adjusting nut is screwed into a fixed screw member fixed to the housing, it rotates smoothly and moves back and forth in the front and rear directions of the mirror surface. The pivot on the head of the adjusting nut is fitted into a spherical catch provided on the back of the mirror holder, and the flexible pawl at the rear end is screwed into the screw member, so as the adjusting nut moves back and forth, the mirror The holder can swing around the central pivot, making it easy to adjust the tilt angle of the mirror, and even if there is a gap between the worm wheel and the housing during assembly, there will be no play in the thrust direction on the screw member or the adjusting nut that meshes with it. Not only is this possible, but the effect of backlash in the thrust direction of the worm wheel can be reduced without increasing the assembly precision of each part such as the housing and worm wheel, reducing the number of tuning steps during assembly. The occurrence of specular vibration can be prevented.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the electric remote control drive device;
Figure 2 is an enlarged sectional view of the main parts of the drive device of the present invention;
The figure is an exploded perspective view of the main parts with the housing omitted, and FIG. 4 is an enlarged sectional view of the main parts showing a modification of the present invention.
FIG. 5 is an exploded perspective view of the main parts of a modified example similar to that of FIG. 4, with the housing omitted, FIG. 6 is a sectional view of the conventional type, and FIG. 7 is a sectional view of the main parts. 10...actuator housing, 11a,
11b... Annular support part, 12... Adjustment nut, 12a... Flexible claw, 12b... Rotational force transmission rib, 12c... Cylindrical body, 13... Spherical pivot, 14... Mirror holder, 15... Spherical surface Seat, 16... Worm wheel, 16a... Cylindrical boss, 16b... Groove, 17, 20... Screw member, 18... Set screw, 17a... Board with rotation stopper, 17b, 20a... Screw rod section,
20b... Spherical pivot, 21... Socket part,
21a... Spherical catch, 21b... Tsuba, 21c...
Protrusion, 22...Settling, 23...Stepped fitting hole, 30...Center pivot.

Claims (1)

[Claims for Utility Model Registration] 1. A mirror holder 14 having a reflecting mirror is tiltably supported with respect to an actuator housing,
An adjusting nut 12 having a spherical portion 13 at its tip that fits into a spherical seat 15 located at a position away from the rotation center 30 of the mirror holder is connected to the front and rear of the mirror surface through a worm wheel 16 of a worm mechanism housed in the housing. This device adjusts the angle of the reflecting mirror by driving it forward and backward in the direction, and a cylindrical boss 16a is formed in the center of the worm wheel 16 through which the adjusting nut 12 can go in and out. On each of the outer circumferential surfaces of the adjusting nut, a rotational force transmitting rib 12b that allows the adjusting nut to move in the axial direction and restricts its relative movement in the circumferential direction, and a groove 16b that inserts the rib.
On the central axis of the worm wheel 16,
A screw member fixed to the housing is provided upright, and a flexible pawl 12a formed protruding from the rear end of the adjustment nut is screwed into the threaded rod portion of the screw member. Electric remote control drive device. 2. The electric remote control drive device according to claim 1, wherein the screw member is fixed by a set screw screwed in from the outside of the housing. 3. The electric remote control according to claim 1, wherein the screw member has a spherical pivot having a rotation prevention means at the end on the mounting side, and the spherical pivot is fitted into a socket portion arranged and fixed to the housing. Drive device.